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AB Magifoam - Can recommend this. Had my 5L bottle for the past year and a half or so, works well and lasts forever. It foams up REALLY nicely (I found some others hardly foam) and can be left for 5-10min easily.
Fill your bottle up with hot water only and give it a blast until empty, perhaps repeat this then try with your foam solution again (ensuring its diluted with warm water).