the hydrochloric acid is not effective in this matter.
Are you heaating the sample ? You can also use NH3 gas, in given link the procedure is described .
https://www.jstage.jst.go.jp/article/isijinternational/54/8/54_1807/_pdf
I would try an oxidizing acid such as nitric acid. Nitric acid should not affect Si or SiO2.
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