Cambsnan
Stop using softener. Unless you use Lakeland one just for towels.
To soften hard towels, soak overnight in a bath with calgon. Then wash as hot as label allows with white vinegar as softener. Then either tumble dry or give them a really good shake before hanging out. Have a look at Nancy Birthwhistle’s green tips on line
... this!
If you don't have a tumble dryer, giving the towels a good shake reshapes the fibres, apparently, and this is what is supposed to keep them soft.


