Trishs re detergent gels, once you think the present bottle is empty, store it up side down. Use the new gel bottle and when it is 3/4 full, upend the old gel bottle to allow the contents to slowly run into the new one. This may take a few hours.
Or pour a little boiling water into the used one, swirl it around and see if that makes adifference.
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) bin to take home and do all the above. 
