Cleaning up while locked in: regular washes and dealing with pee

I originally posted my question about washing routine in the “Hello World” thread where TwistedMister found it and posted a really helpful reply so newbies like me might want to look there for advice on regular washing. However I now want to ask for tips about hygiene when peeing while locked. I tried a couple of times in the normal way but managed to miss with at least half the pee. Since then I’ve pee-ed sitting which works well but is that the only way? Also any thoughts on dealing with post-peeing drips or other advice on peeing generally.