I just won a ebay auction that had over 300 tips and I just recieved them and well I need to really clean them.. Seem to be in good condition just not very clean.. lot of sticky build up... Is there something that would strip them but wont ruin them? I figured like OXY clean... but open to any ideas!
If you have one of those small tip brushes, those work well for getting the inside of the tip clean if there is anything stuck in there.
We have discussed this a few times before so please don't think I am nuts....Someone on here (sorry I forget who right now) suggested putting tips in a microwave safe bowl and COVERING them with water, add a few drops of Dawn and remember to leave enough room at the top for expansion of bubbles. Nuke those suckers for 1-2 minutes. It works great! I will never go back to cleaning my tips with a brush!
I still like the soapy bowl of water with tips sumberged and microwave method!
If I only have a couple, I just throw them in the cutlery bin in the dishwasher!
Every once in awhile I just boil mine in a pan of water on the stove. Drain then let them dry they are so hot they dry fast just don't touch till cool. Should work.
Metal in the microwave?
Hmmm confused on that one.. but guess the water covers it up soooo...
I wouldn't exactly advise that either, but I could see how they might not catch fire if they were in water. I still wouldn't want to take that chance. I do have a textbook from a cooking class that SUGGESTS putting things like foil in the microwave in the microwave cooking section. Isn't that rule #1 for using a microwave...NO metal/aluminum? 
To clean my tips, I just use A LOT of Palmolive/Dawn, HOT water, and a very small brush (bottle brush, tip brush, toothbrush for braces, etc). It works so far for me, but I could see how you might need something more if they're really dirty.
Ive boiled them and scrubbed with brush lot of them came clean but some of them are like a sticky rubbery substance... Almost like grease that has been baked over and over on a pan kinda like... Guess I can try a little oven cleaner???? I mean heck they were a good deal got them like 10 cents a piece so worth it ... IF i can get them clean!
You think the oven cleaner would ruin them...
oven cleaner my take off any finish that is on it try goo be gone suppose to remove any goo or glue should be able to find it at a hardware store.
I have had great success mixing white vinegar with my dish washing liquid. I put this mixture with water in a bowl and let the tips sit for a little while. I come back a little later and scrub with the brush. Depending on how thick the icing was or how many dirty tips, I may have to change the vinegar/water/soap mixture out one time. The vinegar really helps cut the greasiness from the buttercream.
I just won a ebay auction that had over 300 tips and I just recieved them and well I need to really clean them.. Seem to be in good condition just not very clean.. lot of sticky build up... Is there something that would strip them but wont ruin them? I figured like OXY clean... but open to any ideas!
Get someone to clean them for you 
Ok I found something that took buildup right off..... I boiled and boiled tips when I put vinegar in they turned kinda copper color.. anyway.. I pulled them out and used a brush on them still grrrr 
still little rubber feeling on a few of them... AH HA MR Clean Dry Eraser.... So why not!?
I gave it a shot and wow polished those suckers right up and no more gunk... rinsed them in hot water and HAPPY HAPPY JOY JOY now... Just thought you guys would like to know... MR Clean to the rescue again! I just love those Magic erasers... AWESOME !!! A must have in the kitchen...
I put them in a microwaveable container, fill with soapy water ( make sure htey are totally covered with water) and microwave them for a minute or two.. One of the best tips I learned from CC
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