Yes no cons other than it will not getting everything. You reaslly need to get under with a long screwdriver, assortment of wire brush sizes, and good wrap around eye protection. Then go at it. It is significantly easier to do it dry, so consider doing dry work first and then steam clean after.
And then apply undercoating in short order, like waxoyl.
'97 D90 NAS
'06 Argo Avenger