The cement-surkhi plaster used on many Delhi monuments in the early 21st century was found to cover much of the external surface and large portions of the internal surface which were required to be carefully removed and replaced with traditional layers of lime plaster. The internal and external surfaces of the monument were cleansed carefully using water and soft brushes. After cleaning of the surfaces, decayed lime plaster and modern cement plaster was removed. All existing lime plaster such as on the neck of the dome and internal wall surfaces were consolidated.
The incised plasterwork on the central decorative medallion on the internal ceiling, medallions on the spandrels of the arches were carefully cleaned and the missing portions were completed by master craftsmen as per the existing details and specifications using natural colours wherever required.