lol wash it with lemon water all you want... whatever you extract or squish is gonna have fecal matter in it.
even a sieve would not prevent the contamination.
so, how much are you willing to ignore... wash it well and you'll get anything visible off, but don't lie to yourself saying it is clean... even if you do a h2o2 wash, lemon wash then water wash 3-step process... still gonna eat or smoke shit in some amount.
to put it in perspective, you enter a bathroom every day coated in fecal matter, so... at some point it is a small enough percentage of total, but if you don't know where that threshold is for your health, then it's just a guess as good as anyone else's.
have fun smoking that fecal matter :P it's going to be at the back of your mind even if you choose to do it willingly, lol.