"Ten svetr musíš vyprat."
Translation:You have to wash that sweater.
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"Ten svetr musíš prát." That would mean that you are reminding that he or she must wash the sweater regularly. They could tell you this even in the shop when it is completely new. If it is not new, they are probably telling you that you have to wash it more often (if you wash it at all).
"Ten svetr musíš vyprat." means that the sweater needs washing now, it is probably dirty. It needs a wash - one specific wash that will be completed once the washing is done and you hang it to dry. After that the sweater is vypraný - washed.