Water pooling in a toilet-brush holder? Check its drip tray and ventilation
Toilet-brush holders differ in their drip trays and ventilation. Clean accessible holder surfaces with the maker-approved cleaner, dry them and replace the brush correctly.
OXO explains that ventilation slots in its brush canister help water evaporate. IKEA's BOLMEN and STORAVAN care instructions specify wiping with a mild cleaner and drying with a clean cloth. Keep toilet-cleaning tools separate from other household cleaning gear.