How about covering your buggy in sponge with the wheels sticking out at the bottom??
Im only joking.
Well there is no sponge at Batley to use, but if you/anyone can sauce it on behalf of the club and then when YOU help put the track out, YOU won't forget to put the sponge out.
As for York, you are wrong as you make it sound like there are loads of potentially dangerous corners. The only place the sponge is used is immediatly after the entry onto the straight, and at the end of the straight. Personally I think it isn't needed on the entry to the straight as it snags the car and pulls it in, id rather glance off the wall and keep on going.
Chris