I was joking about the tube, the beads I have seen are also in a bag. You throw the bag in and it breaks shortly after you start driving, letting the beads go to work. One other thing, if you break a bag on the floor, it's like ice and they're very hard to sweep up.

'65 C-10, 65 L-60, 65 C-80, 72 C-60 & and a bunch of old Chevy cars.
Never time to do it right, always time to do it over.