I bought a couple of these for my Shadow. It should work just fine, presuming your seals aren't damaged at all. It will remove dirt from inside the seal (where it wipes against the tube). The seals in my old forks were just a bit banged up by the previous owner, and they leaked a little on every ride. The only fix for mine was to get some used forks, verify they had no damage, and put them on the bike.
Apparently, the PO laid the bike down gently on the left side, and the fat part of the fork hit something hard, just distorting the tubes enough. No worries, though.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.