Assalamu Alaikum ,
I would like to know if wudu and by extension salah be valid if one goes to the toilet and doesn’t wash with water afterwards.
Wa Alaikum As Salaam,
The validity of wudhu is based on whether all the essential parts of the body were washed while performing wudhu. If this was done, then wudhu will be valid.
As for the Salah, if you had cleaned yourself properly, not leaving impurities on your clothes or body, then it (the Salah) will be valid, even though you did not use water after using the toilet.
And Allah Knows best
Mufti Waseem Khan