I usually wash my wettie and harness well after each sail. After a few weeks at LG they were looking pretty stiff and old.
The hosing with limestone water probably didn't help.
I've just treated them all in Wetsuit conditioner. A few squirts in a laundry tub and leave them to soak for an hr or even overnight.
No need to rinse just hang everything in the shade to drip dry.
Good as new! Nice and supple again.
I use this from a surf shop. There are lots of others around.
www.naturalnecessity.com.au/products/wetty-wash-by-sticky-johnson?variant=43031852712172&country=AU¤cy=AUD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gclid=Cj0KCQiA_Yq-BhC9ARIsAA6fbAhw_5xOOkuUzfgRg_pZSBIXObksKWhTo4vy_DP5B-e0tNUkuUr9ppsaAhNUEALw_wcB