The slime that forms on the condensate catch or pan which eventually clogs the drain is caused by bacterial growth. In the US at least, you can buy a bottle of condensate treatment tablets. You put a tablet in the drain catch/pan and it will prevent or reduce gel formation.

Now, does anyone know if this is available locally?

My quick and dirty approach to temporarily clear up a clogged drain is to use a wet-dry vacuum cleaner and unclog it from the outside. The problem returns in a few weeks and it will not help if the gel formation is on the condensate pan itself.