How do you clean a bird bath without using harsh cleaners which would be toxic to the birds?

You can hose it down with water and use a little baking soda as a scouring cleanser to remove slime. Then rinse and you can go over it with a little white vinegar if there are stains. Rinse again with water.

Bird Bath Cleaning

Kleen Free Naturally, Natural, Non-Toxic, Enzyme Solution and Multi-Purpose Cleaner …

microbe-lift soy-based bird bath statuary cleaner oz NRUON6QV5MPPWT75YGT9…

Black & Decker CHV1410 Dustbuster 14.4-Volt Cordless Cyclonic Hand Vac $32.88 ROTATING SLIM NOZZLE TARGETS DIRT IN TIGHT SPACESFEATURES 50% MORE REACH THAN THE PREVIOUS DUSTBUSTER DESIGN FOR LESS BENDING & BETTER ACCESSIBILITYBRUSH & CREVICE TOOL ACCESSORIES ARE LOCATED ON-BOARD SO THERE ARE NO LOOSE ITEMS TO MISPLACEWIDE-MOUTH DESIGN MEANS IT CAN EFFORTLESSLY SCOOP UP LARGE DEBRISCYCLONIC ACTION SPINS DUST & DEBRIS AWAY FROM THE FILTER SO SUCTION POWER STAYS STRONGFEATURES…

Sunterra 302107 Birdbath Water Cleaner $10.89 Two disposable, floating, plastic dispensers that treat birdbaths up to 7 gallons for up to 30 days…