i have a few silpat clones and i like them; i'd use them more if they weren't that expensive in larger sizes. more recently, though, i found a chinese company on amazon selling large precut sheets of parchment and whooo boy am i never going back to a roll in a box.
with that said if you want to get silpats (or literally anything else; this works great for clearing up vitamix et al containers, nonstick skillets, etc) clean without using a dishwasher, soak them in a tray with some hot water and a measurable amount of pure sodium percarbonate (e.g. unscented oxy clean). just let it sit in there for a few hours.