Creditors holding valid liens of the following character on property belonging to the estate, to-wit: Vendor's lien reserved in a deed duly recorded; lien created by deed of trust or mortgage, duly recorded, on real or personal property; judgment lien on real estate, duly docketed in the county in which the real estate is situated; lien on personal property created by execution, duly docketed in the county in which the property is located; reservation of title contained in conditional sales contract, duly filed, need not file proof of their said secured claims with the trustee, and in the event they do not do so the property affected shall be sold by the trustee subject to any such liens; but if said creditors file proofs of their secured claims with the trustee and request that the property affected shall be sold by the trustee free of said liens and deliver to the trustee a consent in writing, duly acknowledged in the manner provided for the acknowledgment of releases of liens, the trustee may, if he deems it in the best interest of the estate, record said consent in the release book in the office of the clerk of the county court of the county in which the property is located, and sell the property free and clear of the said lien, but the said lien shall attach to the proceeds of the property at the sale, and the trustee shall pay the said proceeds to the secured creditor to the amount of the secured claim, without any deduction for costs of administration. Creditors holding landlord's liens and other liens not included in those mentioned above shall file proof of their claims in the manner and within the time prescribed for proving unsecured claims, otherwise they shall not be recognized or allowed; but if they are properly filed the lien shall attach to the proceeds of the sale of the property covered thereby. The trustee may sell property belonging to the estate subject to delinquent taxes, or may sell free of taxes, and pay the same, but no proof of delinquent taxes need be filed with the trustee.