I only bought these a week or two ago but they've become essential now because their ability to remove grease and normally tough stains is pretty unbelievable
Plastics, mirrors, fridges, old scruffy microwaves, car dashboards, car windows whatever, rub gently and watch that hard to shift grot disappear
If it's got a film of grease these things gobble it up and make it squeaky clean, and all you need is warm water to squeeze the junk out
Packs are about a quid for 4 sponges but the secret is actually in the foam which is melamine foam and you can buy packs of 100 for under a tenner from a well known site kinda thing
Just thought I'd share