diff --git a/lib/roo/csv.rb b/lib/roo/csv.rb
index cc44cc59..04a638ca 100644
--- a/lib/roo/csv.rb
+++ b/lib/roo/csv.rb
@@ -107,4 +107,14 @@ def read_cells(sheet = default_sheet)
       @last_column[sheet] -= 1
     end
   end
+
+  def clean_sheet(sheet)
+    read_cells(sheet)
+
+    @cell.each_pair do |coord, value|
+      @cell[coord] = sanitize_value(value) if value.is_a?(::String)
+    end
+
+    @cleaned[sheet] = true
+  end
 end
diff --git a/lib/roo/excelx.rb b/lib/roo/excelx.rb
index 82325e94..51630f18 100644
--- a/lib/roo/excelx.rb
+++ b/lib/roo/excelx.rb
@@ -487,6 +487,14 @@ def each_row_streaming(options={})
 
   private
 
+  def clean_sheet(sheet)
+    @sheets_by_name[sheet].cells.each_pair do |coord, value|
+      @sheets_by_name[sheet].cells[coord] = sanitize_value(value) if value.is_a?(::String)
+    end
+
+    @cleaned[sheet] = true
+  end
+
   # Extracts all needed files from the zip file
   def process_zipfile(tmpdir, zipfilename)
     @sheet_files = []
diff --git a/spec/lib/roo/csv_spec.rb b/spec/lib/roo/csv_spec.rb
index c9d3ad58..4d9f6c49 100644
--- a/spec/lib/roo/csv_spec.rb
+++ b/spec/lib/roo/csv_spec.rb
@@ -23,6 +23,20 @@
     end
   end
 
+  describe '#parse_with_clean_option' do
+    subject do
+      csv.parse(options)
+    end
+    context 'with clean: true' do
+      let(:options) { {clean: true} }
+      let(:path) { 'test/files/parse_with_clean_option.csv' }
+
+      it "doesn't blow up" do
+        expect { subject }.to_not raise_error
+      end
+    end
+  end
+
   describe '#csv_options' do
     context 'when created with the csv_options option' do
       let(:options) do
diff --git a/spec/lib/roo/excelx_spec.rb b/spec/lib/roo/excelx_spec.rb
index 800d181f..8523c348 100644
--- a/spec/lib/roo/excelx_spec.rb
+++ b/spec/lib/roo/excelx_spec.rb
@@ -71,6 +71,20 @@
     end
   end
 
+  describe '#parse_with_clean_option' do
+    let(:path) { 'test/files/parse_with_clean_option.xlsx' }
+    let(:options) { {clean: true} }
+
+    context 'with clean: true' do
+
+      it 'does not raise' do
+        expect do
+          xlsx.parse(options)
+        end.not_to raise_error
+      end
+    end
+  end
+
   describe '#sheets' do
     let(:path) { 'test/files/numbers1.xlsx' }
 
diff --git a/test/files/parse_with_clean_option.csv b/test/files/parse_with_clean_option.csv
new file mode 100644
index 00000000..80058f7a
--- /dev/null
+++ b/test/files/parse_with_clean_option.csv
@@ -0,0 +1 @@
+name
Robert Eshleman
\ No newline at end of file
diff --git a/test/files/parse_with_clean_option.xlsx b/test/files/parse_with_clean_option.xlsx
new file mode 100644
index 00000000..8ccd5afb
Binary files /dev/null and b/test/files/parse_with_clean_option.xlsx differ