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Thanks everyone. I'll try the pillowcase method.
Yes, I know I should make him clean them but he's got so much homework and after school clubs that it's quicker for me to do it. Also, being so controlling that I am, I know he wouldn't do a good enough job and would make such a mess that it's just easier not to ask him!! Perhaps in a few years' time once he becomes a teenager and annoys the hell out of me, then I'll just go on strike and get him to do everything!