This is probably a daft question but I can't see any instructions on the packet - can you just chuck the above in the washing machine once they are covered in cack or not?

I normally chuck mine in the washing machine, and let them dry on the line, dont put them in tumble dryer

yep i just put in washer as normal - but like all technical kit i don't use softner with it just washing powder. nerver had any problems with them

It also says somewhere don't put them directly on the radiator to dry

Ah well spotted - that is something I tend to do.....