Answered by Shaykh Faraz Rabbani
Walaikum assalam wa rahmatullah,
a) pre-ejaculate invalidates ablution (wudu);
b) a small amount of filth (less than 5 cm in diameter) is excusable and does not affect the validity of ablution and prayer. Such filth is recommended to remove, but not obligatory.
And Allah alone gives success.
Wassalam
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