Took this from the dorema website
Mildew can also occur when the canvas is used during a long period of
time in a moist environment. During the production of most awnings
synthetic fibres are used which are coated. With most fabrics this coating
is on the outside of the canvas only, because of this, this material will
cause almost no condensation because the fibres on the inside of the
awning will absorb some of the moisture. In this damp condition mildew
can start to settle, which will then lead to the brown spots as mentioned
before. Most of the condensation is caused by large differences in
temperature. This occurs specifically during spring and autumn. When the
humidity in the awning is high for a long period of time, brown spots can
appear on the inside of the awing. Permanent site campers will therefor
experience mildew quicker than people who camp only a few weeks
during the summertime. Otherwise, the mildew does not effect the
quality of the roof material and has also no negative influence on the
durability of the awning.
Cleaning these brown spots is reasonably possible. The inside of the roof
can be treated with a mixture of one part of bleach and ten parts of
water. With the use of a sponge or soft brush you can rub on this mixture.
After the canvas has dried, you will notice that 80% till 90% of the spots
have disappeared. Partially some of these spots might still be visible, this
is inherent to the material. In case you feel the need to do so you can
repeat this treatment.
By using a ground sheet with good sealing qualities condensation built up
can be reduced dramatically. In case you use an awning carpet, it is
advisable to use some foil underneath the carpet to avoid condensation
from building up. Of course it is very important that there is enough
ventilation.
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