How to delete indexes in BIA(BI Accelerator) without rebuilding

As far as I know, when I delete data(request) in an InfoCube, the data on the BI accelerator is not physically deleted, but left as kinda garbage Data(which takes up space on the BI accelerator server).

So I regularly rebuild the BI accelerator index every weekend for the data consistency of the InfoCube and BI Accelerator.

But the thing is that I handle the very huge and important data, so when I make a mistake on the process of rebuilding, it is very critical.

So I just wonder if there is some ways to delete data(Indexes) on the BI accelerator physically, when I delete the same data(request) in an InfoCube. (I want to reduce the number of rebuilding)

Or I would appreciate it if anyone lets me know good alternatives not to rebuild every weekend.

Best regards,

Jeongmoo Lee