But how do you know which ointment you need to use? Every customer has the same appearance and dialogue lines, so are you just supposed to quickly try a little of each one on every customer to find the right choice?
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well, in my case, i keep changing the ointment until I see the bar move fast. there's no sign to it actually, just keep changing the ointment and keep looking at the yellow bar until you see it(the yellow bar) move to the right quicker. I guess it will be changed with next update, depend on the developer.