I don't know if you area new-to-GSD owner or not, but it's worth posting anyway....
GSDs are sort of low maintenance when it comes to coat, aside from regular brushing and de-furing. Their coats are very very good at shedding dirt and schmuck IF you don't shampoo them often. Mine get bathed 2-3 times a year, or if they manage to get into something that damages the coats natural dirt shedding properties. The oils in their coats keep them shockingly clean.
Shiny coats come from premium and properly balanced diet. Salmon in particular will make a black GSD look like he/she is cloaked in a liquid coat.
Never cook bacon while naked.