Everyone is going to shake their heads at this Shooter.
I have a Simmons scope on my Renegade barrel and had the same problem you describe. It was a pain in the butt.
The last two times I cleaned it I just removed the barrel from the stock, removed the nipple from the breech, held the barrel vertical in my left hand, dunked the breech end in a bucket of water far enough to submerge the breech plug - scope and all - and pumped the bore with the cleaning rod in my right hand. The scope was submerged right up to the turrets. Doesn't seem to have harmed a thing - at least it hasn't so far. I guess I ought to write Simmons a nice letter of compliment and/or apology.