In my opinion, save your Pam for making a large batch of Jambaliya or Shrimp Crehoe. (Sorry about the spelling). When you finish using, tip the unit with the carb up, scrap bottom with a heavy duty plastic putty knife and you'll be set for the next time.
I will have to agree with Rivets. Attached is a picture of what I use. I used to use the putty knife on the left, but found the sharp corners make it harder to use. I found the thing on the right when I purchased my HRX. I think it is specifically made for mowers. I haven't had to use it much, though (at least on my HRX), because I have found that the grass I mow doesn't stick to the NeXite deck.