Here are some more detailed and polished versions of your sentence, depending on how you want it to sound:
1. Product review style:
“The mop gets very dirty after just a few uses and is hard to clean properly, so I wouldn’t recommend buying it again. Instead, just a drop of this cleaner works far more effectively and keeps everything fresh.”
2. Instructional / practical tone:
“This mop becomes extremely dirty and unhygienic over time, making it unsuitable for repeated use. Avoid buying it again—instead, use just a drop of this solution for a cleaner and more efficient result.”
3. Short but impactful:
“Very dirty mop—don’t buy it again. A single drop of this does a much better job.”
4. Slightly persuasive (ad-like):
“Tired of dealing with dirty mops? Skip buying them again. Just one drop of this powerful solution delivers a cleaner, fresher result with less effort.”
If you want, I can turn it into a catchy slogan, social media caption, or even an ad script.