Another Long Crack Question

[Sunrise]

what do you use to remove the contamanent from the crack, and how do you remove it?

[Mr Bill]

Supposing a person wished to slide the bridge along a long crack.
Which delta bridge would be most suitable, since you cannot lubricate the suction cup on a bridge which which has a pump on the suction cup?

[mafsu]

For sliding I would use the B200. I have the same cups on my bridges and have used them that way in the past. They worked well.