It is extremely unlikelythat you can find gamma-butyrolactone (GBL) as a cleaning agent in DIY stores. The sale of GBL as a cleaning agent is strictly regulated or even illegal in many countries due to its conversion to gamma-hydroxybutyric acid (GHB), a psychoactive substance with abuse potential.
There are legal and safe alternatives available on the market for cleaning applications. In DIY stores you will find a variety of commercially available cleaning products that have been developed for different applications and comply with the applicable laws and regulations.
It is important to emphasize that the illegal purchase and use of GBL can not only lead to legal consequences, but also pose significant health risks. To ensure your safety, you should stick to legal and approved cleaning products. If you have specific cleaning requirements, you can contact professionals in the cleaning industry for recommendations on suitable and legal products.