Can I use Bathroom & Shower Cleaner on EnduroShield or other protective coatings?Updated a day ago

Most likely yes, but Koh has not independently tested it. Bathroom & Shower Cleaner is mildly alkaline (pH ~8, close to neutral) and non-abrasive, which matches the general cleaning guidance most coating manufacturers (including EnduroShield, ShowerGuard, ClearShield, and similar nano or hydrophobic treatments) publish: mild, non-acidic, non-abrasive cleaners. Because Koh has not run specific compatibility testing with these branded coatings, always spot test a small hidden area first and check the coating manufacturer's own care instructions before going wider.

Skip anything acidic (vinegar, citric acid, descalers, lime removers), anything abrasive (scouring powders, scrub brushes with stiff bristles, melamine pads), and anything with solvents that can strip the coating (acetone, methylated spirits, strong alcohols). Scouring or scratching physically damages the nano layer, and acidic cleaners can etch through the coating over time. Bathroom & Shower Cleaner is non-abrasive and non-acidic, the opposite of these risk categories.

Pick a small hidden area of the coated surface (a corner near the floor, behind a fixed panel, the edge of a shower screen). Spray a small amount of Bathroom & Shower Cleaner, wipe gently with a soft microfibre, wait 5 minutes, then rinse and dry. Check for any change to the coating: dullness, streaking, loss of water-beading (the tell-tale sign a hydrophobic coating has been compromised), or visible damage. If the coating still beads water and looks identical to the untested area, you're clear to use on the rest of the surface.

For any hydrophobic or nano coating, prevention beats cleaning. Use Bathroom Squeegee on glass after every shower to remove water and soap before they dry on. For occasional deeper cleaning, apply Bathroom & Shower Cleaner with a soft microfibre, keep dwell time short, and rinse thoroughly with water. Never scrub, never use anything abrasive, never leave the product on to dry. The coating does most of the work if you stop soap scum from drying onto the surface in the first place.