Can I soften muslin cloths?

[CoffeeCait]

I've got loads of muslin cloths which we use on a daily basis but over time they've got really rough. I use fabric conditioner and have tumble dried them but it doesn't seem to have helped at all

Does anyone have any tips that they've used before?

Thank you

I'd try a hot wash with no detergent or softener as a build up of both can make things feel rough.

my son sucks his muzzy so i wash them all the time i don't use fabric softener and i tumble dry them they are soft sometimes too soft for him as he likes them crunchy so i put them on the radiator/washing line

i use bio detergent too dont know if that makes a difference

Use half a cup of white vinegar as a final rinse to get rid of any calcium deposits. Then tumble dry.