If you have a sta wet palette I bet you have one of those EXPENSIVE yellow sponges in them.
Occasionally my palette gets infested with mold. Yuck. And I need a change. I clean it out with bleach to kill the molds but then I reuse that same old sponge.
UPDATE: After I posted this I reposed you could sanitize sponges in the microwave just like you do for your kitchen sponge. Hopefully it would kill mold. Or maybe freezing it would. Of course at the cost of these sponges vs the coast of paint might as well toss it if mold grows and start fresh.
Today I realized that my Trader Joe’s sponges would work just as well and be cheaper at 2 for $2.59. They are 10×14 instead of $6.80 for one 12x 18″ Sta Wet sponge. Math is in favor of Trader Joe’s sponges.

Sta wet on left Trader Joe’s on right
I love these for wiping up counters, dripped watercolor. I usually have one on the floor and one on the sink. AND you can throw them in the washing machine or the dishwasher to clean them.
Bytw the Trader Joe’s sponge is slightly thicker too so would hold more moisture.
Going to be buying a couple more packs when I go to Atlanta this weekend. LOVE Trader Joe’s.
Margaret xoxox who loves saving $ on art supplies. Leaves more $$ for when I can’t save it on art supplies.