The 3 grout problems you see in every LA turnover
Almost every bathroom we walk into between tenants has one or more of three issues. Knowing which one you have decides whether you reach for a bottle of Tilex, a bag of OxiClean, or a phone to call a tile guy.
1. Mildew and biological staining
The pink film around the tub line and the black speckling in shower corners is biological — bacteria like Serratia marcescens for the pink, and mold colonies for the black. LA bathrooms with weak ventilation grow this fast, especially in older Westside and Mid-City buildings where the exhaust fan is either weak or vents into the attic instead of outside. Surface mildew is almost always cleanable. Black mold that has soaked into the grout for years is not — at that point it has chewed through the cement matrix and the grout itself has to come out.
2. Hard-water mineral build-up
LA tap water sits around 13-17 grains per gallon — that is firmly in the "hard" range. Calcium and magnesium deposit on grout and tile every time a tenant takes a shower, and after a year of use the grout looks chalky, white, and rough to the touch even when it is technically clean. This is what makes a bathroom look "tired" even after a basic wipe-down. CLR, Lime-A-Way, or a vinegar soak dissolves it. Bleach does not — bleach only sanitizes, it does not descale.
3. Cracked, missing, or hollow grout
Run a fingernail along the grout in a 5-year-old shower and you will find chunks missing along the floor edge and powder coming out of the vertical lines. That is structural failure, not a cleaning problem. Once water gets behind a cracked grout line it reaches the cement board or drywall behind the tile, and at that point you are no longer doing turnover cleaning — you are doing a small repair job.
The cleaning workflow that actually works
For a normal turnover where the grout is dirty but structurally fine, the order matters more than the products. Skip a step and you waste the next one.
- Strip the soap film first. Spray the entire wet area with a degreaser or a dish-soap-and-warm-water mix and let it sit 5 minutes. If you skip this step, every cleaner you use after this just sits on top of body oils and fails.
- Descale the minerals. CLR or a 50/50 white vinegar and water solution, sprayed on and left for 10 minutes. Scrub with a stiff nylon brush — never a wire brush, which scratches glaze. This is the step that brings the brightness back to the tile face.
- Treat the biology. Now you reach for the actual mildew killer. You have three real options:
- Bleach gel(Tilex Mold & Mildew, Clorox Plus Tilex). Fastest visible result. Brutal on lungs, brutal on colored grout, and — critical — bleach attacks the silicone in caulk lines. Use it on grout, keep it off the bead.
- Oxygen bleach (OxiClean, sodium percarbonate). Slower, color-safe, no fume hazard, will not eat caulk. Best choice for a fully occupied building where you cannot ventilate hard.
- Steam. A handheld steamer at 200°F+ kills mildew physically and lifts loose dirt out of the grout pores. No chemical residue. Slow, but the right finish for a deep turnover where you want the grout to actually look refreshed, not just disinfected.
- Rinse and dry. Cleaner residue left on grout attracts dirt within a week. Wipe down with clean water and a microfiber, then run the bathroom fan for 30 minutes.
One warning the back of the bottle does not put in big print: bleach and silicone caulk hate each other. A few sprays here and there will not destroy the seal, but soaking your tub-to-tile caulk line in bleach gel for 20 minutes a few turnovers in a row breaks down the silicone and you end up replacing the caulk anyway. If the caulk is yellow or peeling, do not try to bleach it back to white. Cut it out and re-run it. It is a 30-minute job.
Re-caulking: the line between clean and contaminated
Caulk is the thin bead of silicone or latex where two surfaces meet — tub to tile, tile to floor, sink to countertop. It is a wear part. It does not last forever and trying to clean a failed bead is wasted labor. You re-caulk a turnover bathroom when:
- The bead is yellow or brown. That is oxidized silicone — chemically it is no longer flexible, it is just sitting there. Even if it looks intact, it has lost its seal.
- There is a visible gap. Houses settle. Tubs flex under the weight of a person standing in them. Any gap between tub and tile, even a hairline one, is a path for water into the wall cavity.
- You see mildew bloom under the bead. Black or pink shadowing visible through the caulk means moisture got behind it and is growing where you cannot reach. Once that happens, no surface cleaner reaches the colony. The caulk has to come out.
Tools: a plastic caulk-removal blade, a tube of 100% silicone (GE Silicone II Kitchen & Bath, or DAP Kwik Seal Plus for a paintable finish), and painter's tape. Cut the old bead out, scrub the substrate with rubbing alcohol, tape both sides of the joint, run a single bead, smooth it with a wet finger, pull the tape immediately. Done in 20 minutes per joint. Cure time before water exposure is 24 hours — this is why we schedule re-caulking on day one of a turnover, not the morning the new tenant moves in.
When cleaning is not enough: regrout vs full tile replacement
At some point grout stops being a cleaning problem and becomes a construction problem. The deciding factors:
- Regrout when the tile is intact but the grout is cracked, missing in patches, or so deeply stained that bleach and steam cannot bring it back. The tile guy grinds out the old grout to about 2/3 depth, vacuums the dust, and runs new grout in. It is a one-day job for a standard bathroom and the unit looks new again. Typical LA market: $400-$900 for a single bathroom.
- Full tile replacement when tiles are cracked, missing, or hollow-sounding when tapped (delamination — the tile has separated from the substrate), or when you can see water damage on the backer board behind the tile. Once the substrate is wet you are not solving anything by laying new grout on top of it. The wall has to come down to studs and rebuild. Typical LA market: $2,500-$6,000 depending on tile choice and waterproofing.
Quick test for the substrate: tap the tile with a coin. A solid "tick" means the tile is bonded. A hollow "thunk" means it has separated. If 3 or more tiles in the wet area sound hollow, you are past regrouting — water has been getting behind the tile for a while.
What it costs in LA (2026 market)
| Approach | What you get | LA cost (one bathroom) |
|---|---|---|
| DIY grout clean | Bleach gel, oxygen bleach, brush, 2 hours of weekend labor | $15-$40 in supplies |
| Pro grout clean (turnover deep) | Degrease, descale, steam, sanitize, re-caulk if needed | $120-$250 |
| Re-caulk only | Cut out old bead, prep substrate, run new silicone | $80-$180 |
| Regrout (tile intact) | Grind out old grout, re-grout, seal | $400-$900 |
| Full tile replacement (wet wall) | Demo, new backer board, waterproofing, new tile and grout | $2,500-$6,000 |
The lesson the table tells: a $200 deep grout clean every turnover costs less in 5 years than letting the grout fail once and paying for a regrout. And a regrout costs less than ignoring a cracked grout line until water reaches the studs.
California law: what you can and cannot deduct
California Civil Code §1950.5 is the only document that matters when a bathroom grout deduction lands in small claims court. The rules in plain English:
- Light surface staining is normal wear. Grout that looks slightly yellow at the end of a 2-year tenancy is wear and tear — not deductible. A 30-second wipe with a cleaning brush counts as ordinary maintenance, not damage.
- Heavy mildew, cracked grout, and black mold are not wear. If a tenant let a shower mildew so badly that the grout itself has to come out, or never ran the fan and the ceiling paint is peeling, that is excessive use beyond ordinary wear and can be deducted with itemized receipts.
- Black mold is the landlord's problem. Under California implied warranty of habitability and Green v. Superior Court, mold growth caused by inadequate ventilation, plumbing leaks, or building defects is the landlord's obligation to remediate. You cannot deduct mold remediation from a tenant's deposit if the underlying cause was the building (no working bathroom fan, leaking shower valve).
- Itemize, with photos and invoices.Any deduction for grout, caulk, or tile work needs a written, itemized statement and supporting receipts within 21 days of move-out, per §1950.5. A line that says "cleaning $400" with no detail is the first thing a tenant's attorney attacks.
The CDC's guidance on mold remediation is also worth knowing if you are a landlord: any visible mold larger than about 10 square feet is a job for a remediation contractor, not a turnover crew. A bathroom with mold growing that big has a building issue — ventilation, leak, or substrate damage — that has to be fixed before cleaning makes any difference.
How TurnOver LA handles bathroom grout in turnovers
Bathroom grout is on our 12-point inspection list at every move-out clean. The default workflow is degrease, descale with CLR, steam-clean with a 200°F handheld unit, sanitize with oxygen bleach (we keep bleach gel off colored or aged grout), and dry. We re-caulk any tub or sink line that is yellowed, gapped, or showing mildew bloom — same visit, no separate call-out fee. If the grout is cracked or a tile is loose, we flag it on the inspection report and quote a regrout separately rather than trying to clean a structural problem with a brush. Photos go in the turnover packet so the deduction (or lack of one) is documented to the standard §1950.5 expects.