Refrigerator condensate drain tube cleaner

[Chriztopher]

Simple question, the condesate drain tube within my refrigerator does occasionally block up. Not a big problem just looking for a best method.
I clean this with a cotton bud and milton but it does eventually block up again as the drain point is at the lowest point within the fridge and if anything is going to collect, that is where it goes.
My unit is built in so not easy to remove

Can anyone recommend a good cleaning agent I can periodically put down the drain hole that will keep it clean yet not contaminate the fridge with strong smells, or with milton am I already using the best recommended.

Thanks

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