I am a chemist, but that really has nothing to do with my recommendations...more like just using plain old common sense.
First try what hallo gallo recommended.
I realize you have to take you waxes outisde to actually use them, but storing them at room temperature will extend their shelf life. Prolonged exposure to heat will degrade most things to some degree. Will it be a catastrophic failure of the product to work? :nixweiss Probably not, but it could lead to diminished performance of products over time. Considering the cost of many of our detailing chemical "toys", it would be wise to keep them away from extreme light, heat, and humidity.
High heat can evaporate water, some alcohols, and solvents from products. Bottles that are not well sealed could allow oxygen sensitive ingredients to air oxidize. Temperature extremes could also cause products to chemically separate and some may not re-mix completely and still work as effectively or as intended.
I believe a good rule of thumb for detailing chemical storage would be-- if it's hotter/colder or more humid than your indoor climate you will get a shorter shelf-life out of a product and you may notice a decrease in product performance over time, too.