What is a single word to express about a solution or a particular thing which always works/gives fruitful results/solves the problem?
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Old faithful -- Collins
(noun) You can refer to something that has been used or has existed for a long time as an old faithful, especially when it is something you can rely on.
We tested a selection of vacuum cleaners, from old faithfuls to those with the latest features.
Tried and true -- AHD
Tested and proved to be worthy or reliable
Let me deal with it-my method is tried and true.