Positive & Negative, mostly positive.

In my experience, using the cleaner neat on interior surfaces led to an oily residue that required multiple wipes and remained until the next day. Upon consulting Gtechniq's customer service, they recommended the Tri-Clean product for interior applications, citing its superior performance in such scenarios. Conversely, on exterior surfaces like door sills with over two months of accumulated dirt, the cleaner effectively removed the stubborn grime, outperforming many other products I've previously used. Besides my incorrect dilution ratio, when the product did dry on the interior surfaces, it left a pleasant and suttle shine.

Conclusion:

Gtechniq's W5 Citrus All Purpose Cleaner proves to be a valuable asset for exterior cleaning tasks. For interior surfaces, however, their Tri-Clean product may offer enhanced results.​