how to reduce dwg file size?

hi everyone.

im abit lost here...

i've tried allmost everything i found on the web on how to reduce dwg file size:

purge

-purge...regapps ext.

overkill

audit

wblock 

rescalling 

and nothing seems to work, my file size is approx 15mb when it should be no more then 2mb

please help

thx

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