Yerka for sweat stains
Yerka from the pharmacy helps against sweat spots.
There are a lot of people who sweat completely in winter even at low temperatures and no deodorant really helps.
Since I have a very good tip:
Go to the pharmacy and get Yerka. Is relatively expensive for 7.50 euros, but really good. It is used as a deodorant and wears it in the evening with a cotton pad.
The next morning wash as normal and apply normal deodorant and ... no sweat stains or the like.
Editor's tip: The product is also online - Yerka for 14,19?