I guess the idea is to dilute it down to at least 50\50 with water and rinse off in a reasonable amount of time. There's not a whole lot of aluminun inside most fivers, just wood and panelboard. Any aluminum surface in my trailer is painted and unharmed. Interesting point tho all-in-all.
2010 Cedar Creek 5th Wheel 34SATS "The Beast"
2006 Ford F350 Lariat 6.0L Diesel
2003 Harley Heritage Softail "Hogzilla"
1988 Harley Softail Custom "The Fireman"
1986 Marriage to "Wifey" (patience of a saint)