If you are removing ALL the seals and will be replacing them, it should be OK to use "whatever" to get the old stuff off (some things work light years better than others). Just don't let it get on rubber/foam etc. or anything else it will hurt - remembering some compounds can damage the siding on the trailer as well. Read the bottles for the "don't use on this" and read the warnings for whatever materials it will touch. Some of those chemicals can cause immediate, or slow, degradation of various materials so you need to know what you are applying and how the surface you are contacting will react.
You've got the 303 so that's good. I clean my seals with alcohol, wipe off and let it dry, then apply the 303 (do both on the front and back sides) wipe off and let it dry.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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