Struggling w/ accuracy @ 100 yds w/ a slug gun? No kidding?
Sorry... I couldn't resist.

What kind of sights are you using? And what kind of accuracy
are you getting... in other words, what are you calling "struggling"? I ask because it seems alot of people have what I consider unrealistic expectations regarding the accuracy of thier slug guns.
You really shouldn't need to worry about cleaning it till you get it home...