My dad was recently visiting and I was running into the same situation with my 2 year olds. What he did was make a game of it. He first did it to himself, said he was going to blow his nose, and made a loud "HOOONNNKKKK" and was very animated. He did it a few times, said out loud to them "got to blow my nose, (put kleenex to his nose), HONK". He then asked them to hold the kleenex to his nose to "help" him. This was repeated for awhile and now they are better. They still hate it when I just reach down and wipe their nose, but I think that is pretty normal. Good luck.