u/Nekkoren

Hi, I'm traveling by bicycle and I'll be in South Germany for 3 months, I'm looking for a soap bar to use for handwashing clothes, in Italy I could easily find Marseille soap at supermarkets while now in Germany I can't even find similar products, I go to supermarkets almost daily and so far never seen something like that. I very much need to wash my clothes, where can I find soap? As I'm traveling by bicycle I can't just buy a big bottle and also buying online is quite complicated.