Anyway to reset Mac OS X 10.6 without a USB or Install Disc?

I’m working on a personal project on a plastic MacBook and I’m attempting to clear out my previous data but is there anyway to reset 10.6 to a clean slate without a USB or Install Disc? I know that 10.7 was the first one to come with a recovery partition. But is there possibly any sort of terminal command? Or any other alternative way? (I understand you can create a USB or a Disc but I’m abroad and nowhere near my other computers)