I am not sure, but maybe you put the antifreeze in the fresh water tank ?? If that is so then you can cut the water pump on and antifreeze will flow through all lines as you open up faucets. The problem will be if you have any water in the fresh tank before adding the antifreeze. RV antifreeze is made to be used undiluted. Any water in the tank would dilute the antifreeze, and make it less effective, with a higher freezing point.
If you indeed put water in the fresh water tank and there was any water in the tank to start, then go on and run the water pump until the tank runs dry, then completely drain the water tank. Be sure to flush that thoroughly next spring to get the residual antifreeze out. Then follow up the diluted antifreeze lines with pure stuff. There may be a antifreeze siphon hose on the inlets side of your water pump.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263