Never put the pan in the dishwasher after use, instead simply wipe with a tea towel. If there is any heavy incrustation, clean the pan with water, salt and a brush and then leave to dry well on a warm stovetop.
Riess
Riess classic enamelware designs from the 1920-1960s are made in a carbon neutral hydro-powered factory owned by the Riess family in Ybbitz, Austria since 1564