I hand wash my talis once a year in Bath, let it soak overnight etc. Then I iron it on high with plenty of steam. Creases come out very good.
Btw I find that the cleaners make talaisim yellow.
I also note that people are very makpid on a nice esrog while they have no problem with a sweaty, black, yellowed, and even ripped talis. Zeh keli veanvehu: talis, Lulv etc...