The sabots can leave plastic residue over time, especially if you are pushing the speed and/or powder loads.
CVA made a solvent for that called Sabot Shooters solvent which works well, but for the money, just buy some Acetone from Wally World or a hardware store and run a patch or 2 thru the bore, scrubb a little with a bronze brush, follow with another patch or 2 of acetone and there won't be any plastic within a mile of your bore. I do clean with my regular solution before the Acetone though to get the powder fouling out of the way first.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Aim small.........miss small.
Trust God..........but keep your powder dry!