1) Is it sufficient to pour water on the prostatic fluid (wady), or is it necessary to press several times and ensure its cessation? 2) Is it obligatory to look and make sure that a small amount of urine comes out when trying to suppress flatulence, or should one not pay attention to that?

Wadi (prostatic fluid) is an impurity that nullifies ablution (wudu). It is a najas (ritually impure substance). One should not hasten to wash it until certain or predominantly sure of its cessation. Istibra (seeking purity) is the act of ensuring the cessation of the impurity, by expelling any impure discharge from the exit point. Silt (squeezing) and natr (shaking or jerking) are not mandatory; rather, the focus is on achieving a strong presumption that the discharge has stopped. When in doubt about the emission of urine drops, one must disregard them and not pay attention to them, as the default is that they have not exited until proven with certainty.