Note that Future is essentially an acrylic clear coat. a wash of acrylic paint thinned with alcohol is likely to eat straight through your Future coat.
If you are clear coating with Future in preparation for washes/weathering, then your washes should be oils or enamels (thinned with the appropriate medium) rather than acrylics thinned with alcohol.
If your clouding appears to vanish when you wet the model with water, you may (no promises) be able to eliminate the clouding by applying anothe coat of Future to the affected areas.