Download UE4SS from Github
Extract UE4SS contents into Polaris\Binaries\Win64
Extract contents of this file Polaris\Binaries\Win64\Mods
Open UE4SS-settings.ini in Polaris\Binaries\Win64\
set bUseUObjectArrayCache to false and GuiConsoleEnabled to 0 

Set values in Polaris\Binaries\Win64\Mods\remixRemoveSweatDirt\scripts\config.lua as needed 
For no sweat or dirt set IsEnableSweatDirtPlayer1 and IsEnableSweatDirtPlayer2 to 0 respectively

Add remixRemoveSweatDirt : 1 to Polaris\Binaries\Win64\Mods\mods.txt to enable the mod