Small amount of yellow liquid in exhaust ?
 

I noticed a small amount of yellow liquid in both exhausts pipes while car on idle had been 4 hours since I drove it last. After I parked and turned it off about 10 min later I checked my coolant reservoir and has less than the last time I check but still near the full line and oil was maybe a little less than full had got a oil change maybe 2 weeks ago and yellow liquid had disappeared I’m guessing evaporated?
My current set up is uel header on e85
Hope someone can put my mind at ease and sum this up as “normal”?

Oily residue left over? Sop it up next time then let it cool and sniff it/touch it.

Normal. See it all the time in winter under my truck. Moisture plus exhaust. Saw the explaination of the chemistry involved somewhere but nothing to worry about.