Disconnect your keyboard by unplugging it from the PC, or if it has a removable USB cable, just unplug the cable from the PC or the keyboard itself.
Remove the key caps gently with a key cap remover, which is always the safest way to go.
Try to remove the debris and dirt that may have accumulated. We would advise that for further cleaning you can use a brand-new tooth brush (a brand new one and without paste), and cotton swabs which can be dry or lightly moistened with an approved cleaning keyboard fluid, but it's important to never use alcoholic ones or bleach on them, and then to pick out the dirt that has accumulated around the switches or under the key caps.
Wipe around your keyboard slowly and carefully and across the tops and bottoms, so every dust/dirt/grime particle can be removed.
Once you remove the key caps from the keyboard, use a microfiber cloth to clean it.
Don't use the following items to clean the key caps or the keyboard itself: steel wool, cleaning sponges or spray-on lime and calcium removers. Never put your key caps in a washing or drying machine, since this may damage them. Switches cannot be removed from the keyboards, so don't pull on them with the Key cap remover or use force, they can be damaged in this way. It is advised that you don't spray the cleaning approved fluids or alcoholic ones directly on the keyboard itself, they can go into the switches and then make them dysfunction. Never use a bleach disinfectant or dampen a cloth with alcohol when cleaning the keyboard surface and switches or key caps.