All the aluminium from discarded aircraft (and there were a lot more than Luftwaffe could fuel or staff) had to go somewhere... E.g. many bicycles built in the 1950ies had aluminium rims, which would a few years later disappear from the market except for the most high end racing bikes, not to make a mainstream comeback for decades. For a while, even kitchen utensils were hard to get in anything but aluminium. The recycling economy that was developed in wartime scarcity was never completely abandoned in later years.