Just use them with the friggin air bubbles.
When the Ds is on, I can't see the bubbles on mine. Also, on the touchscreen, as time passes the bubbles are being wiped away (from the usage of it).
Anyways, my protectors were cheap-looking. The one I used on the touchscreen got scratched pretty easily, and 3 months later I removed it: I took my upperscreen protector, cut it the same size of the other one, and then put that on the touchscreen!
Anyways, if all fails, kill yourself (6)