We have a "poo-scraping knife"
- scrape it all off either into the toilet or a wodge of TP, then rinse in cold water. But I'm a little obsessive about not getting stains, and I don't like the idea of poo in my washing machine (particularly having seen the state of the filter and the trap in the front after some non-rinsing friends washed a load of nappies in it
ewie ewie ew)...
DD was EBF until about 6 1/2 months and when she started on occasional solids (fruit and potato-based homemade purees mostly) she went through a lovely stage of solid poos (ah, constipation). Nappy changing had never been so easy. Sadly, it didn't last!! I wouldn't worry about staining though, IMO nothing's as bad as breast milk on that front!