As title says... How do people clean these or do i just bin them after every use? Cheers

Do you mean the sponge/foam polish applicators?

Yeah i do.

I usually wash them out in a bucket with my normal car shampoo and when I do a machine wash of microfibres cloths I throw them in with them at 40 degrees using Woolite liquid and white vinegar in the fabric softener drawer.

Yep, just chuck them in the washing machine with your microfibres...job done!