Just spotted a white deposit on shower's grout that has lasted over 25 years.
At least I hope it's a deposit and not the grout crumbling away!
Good sign - it appears to be raised above the surrounding grout.
Any way to determine if it's just a deposit or the grout degrading?
If it is a deposit, best way to clean off the deposit without damaging the grout? A simple nailbush?
