My dishwasher water temp is about 120° and have never had a problem with any plastic on my top rack. If your water temp is substantially higher than you'll have to run a test. Put your test item on the top rack when you do your next dishwasher load and if it comes out okay then your water temp is low enough to safely do the other items. Also like the previous comment said, if you're pouring poisonous chemicals through the funnels, be careful about washing them with dishes you use for eating off of.
Yes you can put your plastic funnels in dish washer. Might be a good idea to pre wash or rinse before you put in your dish washer depending on what was poured through them.
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