This appears to be an expensive product but it is remarkably efficient, and as you only need a few drops each time, I think it should last a long time. It also doesn't have the artificial over sweet odour that many cheaper products have. Safe for the environment, too.
Poo drops really work and a drop or two of poo drops do what it says on the bottle and neutralises the odour . So drop a poo drop or two and you won’t need to say ‘phew’ .