mayo in radiator hg or not?

[krisjones91]

yeah its not loosing any coolant, but its got a mayo in the rad defo and oily looking water,tho in the 3 months iv owned it has not got any worse and is running sweet so i will flush it and fingers crossed it was just a lazy hg change and with no rad flush.
there ya go what the garage said was true then about the washing up liquid lol.
how do i burp the system once iv done a flush and change. is it simply letting the engine tick over with the cap off so it pushes the bubbles out? cheers.