These days, lots of detergents actually work better in cold water. They contain enzymes for dissolving e.g. blood stains, and those enzymes are typically proteins, which fall apart when heated too much. Someone correct me if I’m wrong, but I believe (most?) proteins fall apart around 42°C. This might be simplifying far too much.
But yeah, basically you want to generally wash at 30°C.
These days, lots of detergents actually work better in cold water. They contain enzymes for dissolving e.g. blood stains, and those enzymes are typically proteins, which fall apart when heated too much. Someone correct me if I’m wrong, but I believe (most?) proteins fall apart around 42°C. This might be simplifying far too much.
But yeah, basically you want to generally wash at 30°C.