How to clean under this type of bathtub?

I recently moved to a new apartment and the bathtub has this gap. When I lift the bathtub slightly I can see it’s all dirty underneath, how do I clean this? Do I have to lift it entirely? Call a professional cleaner?
My drain is also different so I don’t know if i can flood the bathroom with cleaning products like I’ve seen in some videos

Some pics: https://imgur.com/a/3GkwNjY

edit: this kind of tub has a non-removable shield

by funkytowel9

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