DS1 and DS2 both have trainers which still fit them but are very scuffed and grubby looking, with worn soles. They have new trainers for wearing at weekends, but I am tempted to put their old ones in their PE bags to use in school. PE is only 1hr a week. AIBU to do this, or should I use their new ones (running the risk that they will be left in school and so they have to wear their school shoes at weekends) or buy another new pair each?
(FWIW I have just put both pairs in the washing machine, which might kill the trainers and/or the machine, or possibly both, solving the problem instantly...)