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CorpseFinder
The CorpseFinder tool finds files belonging to apps that are no longer installed.
By default all risklevel options are off. Only enable them if you know what you are doing and before deleting anything, check the results first. Enabling a risklevel option increases the chance that files are deleted that you didn't want to delete.
Risklevels mostly apply to whitelist locations, such as the root of your public storage (/storage/emulated/0). Such locations have no common naming pattern and SD Maid can only determine ownership through a manually maintained database.
Desirable remanents are files with known owners that are not installed, but are internally flagged by SD Maid as KEEPER. Usually these are user created files, e.g. photos you took.
Some apps just use very common name. There are probably hundreds of note taking apps that create a folder /sdcard/Notes to save data in. SD Maid may know one of those app and it is not installed on your phone, but SD Maid can't be sure that there isn't still another app on your phone using that folder and SD Maid doesn't know that this app also uses that folder.
Each filter is responsible for a specific data area. By enabling a filter, the CorpseFinder will search that additional area.