Depending upon its construction, that bamboo peel might actually be better than the other more traditional wood peels which exhibit a tendency to split and/or warp over time. Do not wash it, just wipe it down. I normally don't like to oil that type of peel as it can make it more difficult to peel the pizza into the oven, instead, I like to burnish the peel with a fine grind corn meal from time to time. Don't worry about stains on your peel either, they just give it more character. If you like it, and it works well for you apply the rest of your money toward buying a metal blade peel for removing the pizzas from the oven.
Tom Lehmann/The Dough Doctor