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I've had to bin some if they start to shed fibres, usually after 15-20 years!
There are lots of different cleaning methods, some guys put them in the washing machine. I wash them really well, scraping the paint out then spin them dry. If the water coming out when you spin them isn't clean then you need to wash them again.
I'm not using rollers exclusively and I've tended to use small ones and brush out the finish for quite a few years. I do sometimes bash a lot of rooms out with a roller but I'll use an 18" roller frame or smaller if the surface is uneven.
I don't like washing them but it's that or buy new ones.
How many times do you reckon on cleaning a sleeve before chucking it? They’re never the same after the first use but I tend to hang on to them.