Obviously, a small enema is not enough to be as clean as you should be when you go on camera or on a sex date (etc) and plan on getting fucked or fisted extensively. If there's still anything dirty going on after cleaning yourself, then you haven't done enough.
Personally, I'm picky in these respects and I clean myself very deep and thoroughly until I'm sure I'll stay 100% clean for several hours. (yes, this can involve not eating for a day before this, and the cleaning process is time-consuming too)
If your "ass-slime" is completely clear, there's nothing to fear from anything else either.
If there's still anything dirty going on after cleaning yourself, then you haven't done enough.
Personally, I'm picky in these respects and I clean myself very deep and thoroughly until I'm sure I'll stay 100% clean for several hours. (yes, this can involve not eating for a day before this, and the cleaning process is time-consuming too)
If your "ass-slime" is completely clear, there's nothing to fear from anything else either.