From Apollo 11 Moon landing: conspiracy theories debunked
The following reasons have all been offered as proof that the Moon
landings which began with Apollo 11's touchdown on July 20 1969 were
5) The footprints in the fine lunar dust, with no moisture or
atmosphere or strong gravity, are unexpectedly well preserved, as if
made in wet sand.
The lack of wind on the moon means the footprints in fine, dry lunar
dust aren’t blown away in the way they would be if made in a similar
substance on Earth.
A clear footprint cannot be made in vacuum because there is no
moisture to hold its shape.
The Build Team first tested whether
dry or wet sand made a more distinguishable footprint by stepping in
them with an astronaut boot. It was clear that the wet footprint had
more detail than the dry footprint. They then placed sand similar in
composition to the Moon’s soil in a vacuum chamber and stepped on it
with an astronaut boot, which made a clear print. The reason provided
for this was that the unique composition of lunar soil allows it to
behave differently than terrestrial soil.
It's also listed in Wikipedia under Moon landing conspiracy theories.
Unfortunately, I'm not totally happy with the quality of the sources. The Telegraph is a general purpose newspaper, and the person who wrote the article doesn't seem to be scientist. Likewise, the Mythbusters are not expert scientists. Similarly with Wikipedia...