Remove Keys From PropertyBag on FeatureDeactivating Override
You can add keys to spweb propertybag trough a feature using CAML:
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<PropertyBag ParentType="Web" RootWebOnly="False">
<Property Name="MyCustomProperty"
Type="string" Value="MyValue" />
</PropertyBag>
</Elements>
The property is…