The Director of Public Works shall also transmit to the Bureau of Delinquent Revenue, on the expiration of such 90-day period, a statement of each such unpaid cost of repair, together with the cost of verification and filing of claim therefor. The bureau shall endeavor diligently to collect the same on behalf of the City and County by foreclosure of the lien therefor or otherwise. Any and all amounts paid or collected shall replenish the revolving fund hereinafter provided.