A lot of nappies, and clothing in general have low temp washing instructions than you can wash them at - part of the bid to cut greenhouse gases and make us all wash at lower temperatures. We always washed Bright Bots at 40 or 60, bit of colour comes out initially but they are fine, and fine to tumble too.
Same with all this 'dry clean only' when you know it's largely cotton or man made fibre that normally washes OK. I have a really nice suit I can lob in the machine at 40, washes like an old rag, stick in drier for 15 mins then hang while warm and it comes out smart as anything ready for the next wedding yet is clearly marked 'dry clean only'& 'do not tumble dry' - which is why I washed it in the machine, otherwise how would it be wet enough to want to tumble dry?!