Any hope for crispy armpits?

[Legacy]

or is the bin the only option....?

certain of mine and DH's shirts and tops seem to have 'crispy' hard underarms - what is it - build up of sweat (we DO wash regularly!) or build up of deodrant or what?

Is there anything that takes it out, before I bin them?

I think it's deodorant - does he use an aerosol because I think that makes them worse - and why is it just men's things ?