I haven't had any work like that on mine...but based on scoping out the suspension on my SD, it doesn't look too complicated.

The $700 doesn't sound TOO unreasonable...someone is going to have to spend the better part of a day reefing on assorted parts, trying to get the good ones off in one piece.

I would say maybe mildly sprinkled, light spray, but not full blast hosed...if the guy told you is actually what you need done.

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83 SD 143 K miles
93 Grand Caravan 130K miles
92 Buick Regal (winter car)